I don't think we have ever seen such a reversal, the closest might be Microsoft's attitude towards open source, but that is apples and oranges. Facebook used t

I don't think we have ever seen such a reversal, the closest might be Microsoft's attitude towards open source, but that is apples and oranges. Facebook used to be more open. You could connect to Facebook Messenger using any Jabber/XMPP. They never reversed course, if anything they made it harder to use Messenger without the application.